System.Net.WebClient.UploadDataAsync C# (CSharp) Method

        public void UploadDataAsync(System.Uri address, byte[] data) { }
        public void UploadDataAsync(System.Uri address, string method, byte[] data) { }

        private bool UploadRange(Range r)
        {
            System.Net.WebClient client = new System.Net.WebClient();
            client.Headers.Add("Content-Range",
                               "bytes " + r.pos.ToString() + "-" + (r.end - 1).ToString() + "/" + fileSize.ToString());

            byte[] data = new byte[r.Len()];
            fs.Seek(r.pos, SeekOrigin.Begin);
            int len = fs.Read(data, 0, (int)r.Len());

            if (len != r.Len())
            {
                throw new IOException("unable read expected size.");
            }

            client.Headers.Add("Content-MD5", CalcMD5Hex(data));


            client.UploadProgressChanged += new System.Net.UploadProgressChangedEventHandler(OnRangeUploadProgressChanged);
            client.UploadDataCompleted   += new System.Net.UploadDataCompletedEventHandler(OnRangeUploadDataCompleted);

            UploadInfo info = new UploadInfo();

            info.wc             = client;
            info.totalBytes     = len;
            info.uploadedBytes  = 0;
            uploadInfos[client] = info;

            client.UploadDataAsync(new Uri(uploadUrl), "POST", data, client);

            return(true);
        }